Downloaded from https://www.everyspec.com MIL-STD-81OD ~~ 19 ,Ju~y 1983 Step Document the results for comparison with data obtained in paragraph ,11-2.2,Step 5. II-3.7 Procedure VII - pvrOte@Qk. Same as 11-3.1, except that meaaured or analytically derived data shall always be used as test conditions. ,,.,; II-3.8 ~edure VIII ~ ,.: ; ,,., ..!1, ,,..?{.,, Step 1. Position.one fully loaded railroad car on a level section’of ,. track. ,, ..., Step 2. ‘ Set the airbrakes in the emergency application position on the .; buffer car. The.total gross mass (which will include a buffer.:loadsecurely j mounted to the car to prevent shifting) shall be 99,880 Kg (220,000 pounds), minimum. ,.f ,, Step 3.
Mount the test item on the end of the test car in direct contact with the floor and adequately blocked and secured to prevent any longitudinal, vertical, or lateral movement. Use metal banding, or wire, of sufficient size or strength to provide additional tiedown strength. Inspect blockings and tie- downs after each impact. If damaged or loosened, repair then?prior to the next impact. HOweVer, do nOt alter or repair tiedown attachments that are built-in. parts of the test item during the test. Specify positions of the equipment with respect to the test car and,whether .or not packaging is necessary.
If loading and tiedowns are not specified, all loading and tiedowns shall be in accordance with recommended practices of the Association of American Railroads. Step 4. Impact the test car into the loaded car. Step 5. Impact shall be made in progressive steps with impacts of 13, 14.5, and 16.2 Km/hr (eight,.nine, and ten miles per hour), 3 five percent.. Meaaure the speed just prior to impact by electronic or electrical meana.. Step 6. Visually inspect the test item for physical degradation. Step 7. Document the results for comparison with data obtained in paragraph II-2.2, step 2. . ,, ..., Step 8. Perform an operational checkout of the test item in accordance with the approved test plan.
,, . Step 9. Document the results for comparison with data obtained in paragraph II-2.2, step 5. :* II-3.9 &wedure Ix Cat~rested ~ . . Steu 1. Mount the test item to its vibration fixture as described in metho~” paragraph 1-4.2.5 for the first test axis. ... .. Step 2. Attach accelerometers described instrumentation. in method 514.3 and other test Step 3. Conduct an operational checkout accordance with the approved test plan. and visual examination in MSTHOD 516.3 19 July 1983 516.3-24